Oddly enough, the blood haemoglobin oxygen saturation.
Low Oxygen saturation or hypoxia is a low level of Oxygen in the blood stream not to be confused with oxygen bound to haemoglobin
Oxygen saturation, the percentage of hemoglobin oxygen binding sites that are occupied by an oxygen molecule, is usually measure with a pulse oximeter (also spelled oxymeter). This is a device that...
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90-100%. Anything below 90% saturation is considered hypoxic.
With a pulse oximeter on the upper right extremity (i.e. right wrist/hand)
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